Puzzles worth thinking about.

Help when you are stuck. A challenge when you are ready.

The Nonogram Solver helps you check a set of clues, find solutions, or explore a logically certain next step. It separates a unique answer from multiple possible answers and tells you when a search has reached its limit. A result is useful only when you know what it means.

Sokoban offers a different kind of challenge: move the boxes onto their goals, with room to undo a mistake and try another route. You can play without installing an app or creating an account.

Built around the puzzle

Puzzle calculations run in your browser. Your saved puzzle and game progress stay in that browser, and sharing creates a link containing the state you choose to share. Our privacy policy explains these choices and their limits.

The site starts with a small collection so that each tool can be useful on its own. New features will follow real problems people encounter, rather than a requirement to add more pages or games.

Something does not look right?

A wrong result, an unclear hint, or a board that is hard to use is worth reporting. Visit Contact for the details that help reproduce a problem. Please also get in touch if you have a question about the source of a published puzzle.